From 00c43e0ca43cbae7daacb5d0931028045fb45e51 Mon Sep 17 00:00:00 2001
From: "Pedro F. Giffuni" <pfg@FreeBSD.org>
Date: Wed, 11 Jul 2012 22:17:58 +0000
Subject: [PATCH] Merge libedit adjustment from NetBSD.

On recent versions of NetBSD's libedit, el_gets
now sets el_len to -1 on error so we can
distinguish between a NULL string and an error.

This fixes sh from exiting with newer versions
of libedit now allowing EINTR to return.

Obtained from:	NetBSD
Reviewed by:	jilles
MFC after:	3 weeks
---
 bin/sh/input.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bin/sh/input.c b/bin/sh/input.c
index 3ceaea40e39f..12f285f8b423 100644
--- a/bin/sh/input.c
+++ b/bin/sh/input.c
@@ -186,7 +186,7 @@ retry:
 		if (rl_cp == NULL)
 			rl_cp = el_gets(el, &el_len);
 		if (rl_cp == NULL)
-			nr = 0;
+			nr = el_len == 0 ? 0 : -1;
 		else {
 			nr = el_len;
 			if (nr > BUFSIZ)